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| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-M4.625NotesDue20234Member"> 4.625% Notes due 2023 </dei:Security12bTitle> |
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| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes1.375PercentDue2025Member"> 1.375% Notes due 2025 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes1.375PercentDue2025Member"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes3.900PercentDue2026Member"> 3.900% Notes due 2026 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes3.900PercentDue2026Member"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes6.000PercentDue2036Member"> 6.000% Notes due 2036 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes6.000PercentDue2036Member"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-M5.70SeniorNotesDue20416Member"> 5.70% Senior Notes due 2041 </dei:Security12bTitle> |
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| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-M5.250SeniorNotesDue20415Member"> 5.250% Senior Notes due 2041 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-M5.250SeniorNotesDue20415Member"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes4.625Percentdue2044Member"> 4.625% Senior Notes due 2044 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes4.625Percentdue2044Member"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes5.125PercentDue2045Member"> 5.125% Notes due 2045 </dei:Security12bTitle> |
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| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes4.500PercentDue2047Member"> 4.500% Senior Notes due 2047 </dei:Security12bTitle> |
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| <dei:SecurityExchangeName contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes4.500PercentDue2047Member"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes4.950PercentDue2064Member"> 4.950% Senior Notes due 2064 </dei:Security12bTitle> |
| <dei:TradingSymbol contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes4.950PercentDue2064Member"> JCI64A </dei:TradingSymbol> |
| <dei:SecurityExchangeName contextRef="duration_2020-09-08_to_2020-09-08_us-gaap-StatementClassOfStockAxis_jci-Notes4.950PercentDue2064Member"> NYSE </dei:SecurityExchangeName> |
| <dei:EntityEmergingGrowthCompany contextRef="duration_2020-09-08_to_2020-09-08"> false </dei:EntityEmergingGrowthCompany> |
| </xbrl> |